Description
1) [4 points] Prove that 9 | (4#$ + 8) for every integer � ≥ 0.
2) [4 points] Prove that ∑ (8� − 5) $
/01 = 4�3 − � for every positive integer n.
3) [4 points] Prove that 13 + 23 + 33 + 43 + ⋯ + �3 = $($91)(3$91)
: for every positive
integer n.
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